Allergy symptoms range from mild to severe, symptoms being rash, itchy water eyes to difficulty in breathing. Severe cases can be life threatening which can start with itching of the eyes or face and progress to severe case of Diarrhoea, Cramps, Vomiting, Some common asthmatic symptoms are: nonstop coughing, wheezing, tight chest accompanied with pain or pressure, shortness of breath. Symptoms vary from individual to individual and need not be in the provided order.